plain diff does not match viewer commit diff
https://gitlab.com/gitlab-org/gitlab-ce/commit/1f84518ab7128e302f44085b4ecd8686f3f2ea2d
presents a completely different diff than
https://gitlab.com/gitlab-org/gitlab-ce/commit/1f84518ab7128e302f44085b4ecd8686f3f2ea2d.diff and https://gitlab.com/gitlab-org/gitlab-ce/commit/1f84518ab7128e302f44085b4ecd8686f3f2ea2d.patch
Which are the paths on the "plain diff" and "email patches" links, respectively, for the former.